Mini Cooper Clubman Tail Light Bulb Size

The Mini Cooper Clubman tail light requires P21W and 12961 bulb sizes for the rear lighting assembly. Data for the specified components covers the period from 2016 through 2022.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2021-2022	P21W
2016-2019	12961

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

Other Locations

Additional Notes

The P21W is an ECE-standardized single-filament bulb operating at 12 volts and 21 watts, fitted with a BA15s bayonet base. This base type uses a single contact pin and is a common format in European-market signalling applications.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12 volts and 5 watts. The wedge base design relies on the bulb's glass envelope and wire leads to create the electrical connection rather than a separate metal base.
The P21W and 12961 are not interchangeable. The BA15s bayonet base and the W2.1x9.5d wedge base are physically incompatible, and the wattage difference between 21W and 5W reflects a significant difference in intended function and circuit load.
The Mini Cooper Clubman uses the 12961 bulb for the tail light across the 2016-2019 model years, while the 2021-2022 model years use the P21W.
The shift from the 12961 to the P21W between model years represents a change in both base type and wattage, indicating that the tail light housing and socket configuration differ between the earlier and later production runs of the Cooper Clubman.